body {
  height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  line-height: 1.5;
  background-image: 
    linear-gradient(to bottom, lch(0 0 0 / 0.5), lch(0 0 0 / 0.9)),
    url('https://images.unsplash.com/photo-1651385787329-475458f7f342?crop=entropy&cs=srgb&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE3NzkzOTYyNTF8&ixlib=rb-4.1.0&q=75');
  background-size: cover;
  background-position: center center;
  color: white;
}

img {
  mix-blend-mode: difference;
}

a {
  color: lightblue;
}